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. MARTIN.

SAFETY LIFT.

No. 271,884. 'Patented Feb. 6, 18

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' UNITED STATES -FATENT p GEErcE.

y MORITZ MARTIN, OF BITTERFELD, PRUSSIA, GERMANY.

SAFETY-LIFT.

p SPECIFICATION forming part `of Letters Patent No. 271,884, dated February 6, 1883.

Application filed June 23,1882. (No model.) Patented in Germany Aprill, 188i, No.18.387,

To all whom 'it may concern:

BeitknownthatI, MORITZMARTIN, residing in Bitterfeld, in the Kingdom Iot' Prussia, Ger- Vman Empire, have invented new and useful 4Improvements in Safety-Lifts, -(for which I have obtained Letters Patent in Germany, April 1, 1881, No. 18,387,) of which the following isa specification.

My invention relates to lifts such as are used in factories and warehouses for raising and lowering goods and persons from one story to another; and the improvements consist in fitting to the openings through which the cage passes, under the arrangement and in the man-d ner hereinafter described, movable guard-rails o r fences, which are brought into their place and locked by the action of the cage whenever the latter leaves a door, and which can he `opened only when the cage-is in the opening.

In the accompanying drawings,Figure lis a l transverse sectional elevation of a part of the lift, showing the guard-rail arrangement. Fig. 2is a back View of the same; Fig. 3, a sectional plan on line a: ai, Figs. 1 and 2, with the' cage somewhat below the door; and Fig. 4,4a section on line y y o'f Fig. 3. ,Figs 5 and 6 show a modiliedarrangement of the guardrail mechanism.

The guard-rail, by which the opening in the floor throughwhich the' lift passes is Vprotected in front, isl shown in Figs-1 and `3. The same consists of a bar of iron, lc, attached to or forming part of an axle, k' whichis mounted in the posts ffz, so as to be free to rotate therein, while the bar orraillcreaches across the space between the posts f2 and f3. To the rear end of the axle-7c two arms, u u', are so fixed as to be at right angles, or nearly so, to the rail 7c. The said rail,- when let down, rests with its free end in the bracket n.

m and lare tappets fixed to the cage, and adapted to strike against the arms u and u', re spectively, when these are in the position shown by dotted `lines in Fig. 2 and the rail la is in a vertical position.

o is a bolt, by which the rail is secured in `its position when let, down. This bolt is in! and over vthe rail 7c. To the rear end of the- Besides, the bolt is so arranged that it can' only with difficulty be pushed back by hand. In rising from its position below the tloor, the cage iirst-of all acts with the cam-surface q ou the roller t, (see Fig. 4, where these partsare shown in dotted lines,) and pushes -the bolt o back, so that the raillc may then beturned up by hand to make the passage to the platform of the cage free. By this turning the arms'u and u will be brought into horizontal position. (See Fig. 2.) When the cage is to be lowered again the guard-rail may first be turned down by hand, if desired; but in case this is not done it will be 'tilted and turned down by the tappet m striking against the arm u. Thereafter the cam-surface q leaves the roller t, thus setting the spring p free to push the bolt o forward again forrelockingtheguard-rail. When the cage is descending from a higher floor the camsurface 1' will cause the unlocking of the guard-rail. On theother hand, when the cage is to be raised to a higher floor, the guard-rail, if not previously turned down by the attendant, is tilted by the tappet l striking from bei low against the arm u'. The guard-rail is thus always closed, and the holt withdrawn or released automatically at the proper moment.

Below the bar k and parallel thereto one or more other bars may be arranged, which are pivoted to the post f? aud connected to lt by links. By these bars, which will be llifted and let down together with the bar k, additional security is obtained in fencing in the opening in the licor.

When, in the construction described, the

guard-rail is tilted down automatically it will come down with considerable speed and strike rather forcibly on the bracket n. If this should be found objectionable, the modification represented by Fig. 5in elevation and by Fig.6in plan IOC may be adopted. The tappet m in this case consists by preference of an inclined rib; but this formvis not absolutely necessary. Opposite to m there is a rib or surface, m', Which, however, must be inclined in order to act properly, and Whose distance from m is slightly greater than the diameter of a lateral projection, u2, with which the arm u is provided. When, with this arrangement, the tappet m .h as, by acting against the projection u, tripped the guard-rail, the latter will not come down at once; but it will be lowered slowly on account of the projection u? leaning against the rib m', which controls the motion of the guardrail until the latter has attained the position shown in dotted .lines in Fig. 5, when it will be released and allowed to drop. The arrangement of the tappet l, the controlling-rib l', and the projection us on the arm u are analogous to the parts described, and therefore do not require any further explanation.

I claim as my invention- A 1. The guard-rail k, turning on the axle k',

to which are fixed the arms u and u', acted upon by the tappets m and l, attached to the cage of the lift, all combined substantially as and for the purpose specified.

2. In combination with the guard-rail k, axle 7c', arms .u and u', and tappets m and l, the controlling-surfaces m and l', and lateral projections u2 and a3 on the arms u and u', respectively, co-operating therewith, as and for the purpose described.l

3. In combination with the guard-rail Ic, axle la', arms u and u", and tappets m and l, the bolt o, provided with spring p, and having an arm, s, carrying the roller t, which is acted upon by the cam-surfaces q and r, as specified, and for the purpose stated.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MORITZ MARTIN.

Witnesses: l

H. SPRINGMANN, B. Rol. 

